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Ubuntu Security Notice USN-2545-1

Ubuntu Security Notice USN-2545-1
Posted Mar 24, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2545-1 - A flaw was discovered in the automatic loading of modules in the crypto subsystem of the Linux kernel. A local user could exploit this flaw to load installed kernel modules, increasing the attack surface and potentially using this to gain administrative privileges. A flaw was discovered in the crypto subsystem when screening module names for automatic module loading if the name contained a valid crypto module name, eg. vfat(aes). A local user could exploit this flaw to load installed kernel modules, increasing the attack surface and potentially using this to gain administrative privileges. Various other issues were also addressed.

tags | advisory, kernel, local, cryptography
systems | linux, ubuntu
advisories | CVE-2013-7421, CVE-2014-9644, CVE-2015-1421, CVE-2015-1465
SHA-256 | f0d96d401b0085cca787c43e9e7cf167b99f5f483a755be670dfc9be5e09397f

Ubuntu Security Notice USN-2545-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-2545-1
March 24, 2015

linux-lts-utopic vulnerabilities
============================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux-lts-utopic: Linux hardware enablement kernel from Utopic

Details:

A flaw was discovered in the automatic loading of modules in the crypto
subsystem of the Linux kernel. A local user could exploit this flaw to load
installed kernel modules, increasing the attack surface and potentially
using this to gain administrative privileges. (CVE-2013-7421)

A flaw was discovered in the crypto subsystem when screening module names
for automatic module loading if the name contained a valid crypto module
name, eg. vfat(aes). A local user could exploit this flaw to load installed
kernel modules, increasing the attack surface and potentially using this to
gain administrative privileges. (CVE-2014-9644)

Sun Baoliang discovered a use after free flaw in the Linux kernel's SCTP
(Stream Control Transmission Protocol) subsystem during INIT collisions. A
remote attacker could exploit this flaw to cause a denial of service
(system crash) or potentially escalate their privileges on the system.
(CVE-2015-1421)

Marcelo Leitner discovered a flaw in the Linux kernel's routing of packets
to too many different dsts/too fast. A remote attacker can exploit this
flaw to cause a denial of service (system crash). (CVE-2015-1465)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.04 LTS:
linux-image-3.16.0-33-generic 3.16.0-33.44~14.04.1
linux-image-3.16.0-33-generic-lpae 3.16.0-33.44~14.04.1
linux-image-3.16.0-33-lowlatency 3.16.0-33.44~14.04.1
linux-image-3.16.0-33-powerpc-e500mc 3.16.0-33.44~14.04.1
linux-image-3.16.0-33-powerpc-smp 3.16.0-33.44~14.04.1
linux-image-3.16.0-33-powerpc64-emb 3.16.0-33.44~14.04.1
linux-image-3.16.0-33-powerpc64-smp 3.16.0-33.44~14.04.1

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References:
http://www.ubuntu.com/usn/usn-2545-1
CVE-2013-7421, CVE-2014-9644, CVE-2015-1421, CVE-2015-1465

Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-33.44~14.04.1
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